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Habitat refuges crucial in streams with low summer flows

Vander Vorste et al. (2020). Global Change Biology 26:3834-45.

Throughout much of California, Pacific salmon populations have been reduced to mere fractions of their former abundance. Although human-driven environmental changes threaten all of California’s remaining salmon runs, stocks that reproduce in intermittent streams—those that flow only during rainy months—may be especially at risk. Check out the Science Spotlight.

Review provides body of evidence that estuary development can put juvenile salmon at risk

Hodgson et al. (2020). Global Change Biology 26:1986-2001.

A recent literature review—the first to systematically review studies of estuary development impacts on juvenile salmon—has identified multiple activities and stressors with likely negative impacts. Pollutants, habitat modification, and sea lice are among the activities and stressors that consistently pose moderate-to-high risks to juvenile salmon.  Check out the Science Spotlight.

Giving up a little harvest can have large conservation benefits in a mixed-stock salmon fishery

Connors et al. (2020). Canadian Journal of Fisheries and Aquatic Sciences 77:1076-89.

Alaska’s Kuskokwim River is home to more than a dozen Chinook salmon populations—and the largest Chinook subsistence fishery in the world. A new study evaluating alternative harvest policies in this mixed-stock fishery found that relatively small reductions in catch had disproportionately large benefits for conserving population diversity. Check out the Science Spotlight.

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